Mazon Creek Fossil Fauna
Trace Fossils
Coprolites and Trails
Coprolites
Fish coprolite, Milwaukee Public Museum P28708
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Three specimens of fish coprolite, A.Young collection - Pit 11, Braidwood, Illinois
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A.Young collection - Pit 11, Braidwood, IL (left and above)
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Fish coprolite, A.Young collection - Mazon River, Morris, Illinois (containing tiny bivalves)
Fish coprolite, A.Young collection - Mazon River, Morris, Illinois